Move histogram to test/core/util
diff --git a/BUILD b/BUILD
index d904a1e..82ac73f 100644
--- a/BUILD
+++ b/BUILD
@@ -54,7 +54,6 @@
     "include/grpc/support/avl.h",
     "include/grpc/support/cmdline.h",
     "include/grpc/support/cpu.h",
-    "include/grpc/support/histogram.h",
     "include/grpc/support/host_port.h",
     "include/grpc/support/log.h",
     "include/grpc/support/log_windows.h",
@@ -79,10 +78,11 @@
     "include/grpc/byte_buffer.h",
     "include/grpc/byte_buffer_reader.h",
     "include/grpc/compression.h",
-    "include/grpc/load_reporting.h",
+    "include/grpc/fork.h",
     "include/grpc/grpc.h",
     "include/grpc/grpc_posix.h",
     "include/grpc/grpc_security_constants.h",
+    "include/grpc/load_reporting.h",
     "include/grpc/slice.h",
     "include/grpc/slice_buffer.h",
     "include/grpc/status.h",
@@ -446,7 +446,6 @@
         "src/core/lib/support/env_posix.cc",
         "src/core/lib/support/env_windows.cc",
         "src/core/lib/support/fork.cc",
-        "src/core/lib/support/histogram.cc",
         "src/core/lib/support/host_port.cc",
         "src/core/lib/support/log.cc",
         "src/core/lib/support/log_android.cc",